java 获取汉字的汉语拼音首字母的实现代码

public class GetFirstLetter {
     private static final int GB_SP_DIFF = 160; 
     private static final int[] secPosvalueList = { 
           1601, 1637, 1833, 2078, 2274, 2302, 2433, 2594, 2787, 
           3106, 3212, 3472, 3635, 3722, 3730, 3858, 4027, 4086, 
           4390, 4558, 4684, 4925, 5249, 5600}; 
     private static final char[] firstLetter = { 
           'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 
           'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 
           't', 'w', 'x', 'y', 'z'}; 
     
     public static String getFirstLetter(String oriStr) { 
         String str = oriStr.toLowerCase(); 
         StringBuffer buffer = new StringBuffer(); 
         char ch; 
         char[] temp; 
         for (int i = 0; i < str.length(); i++) {  
           ch = str.charAt(i); 
           temp = new char[] { 
               ch}; 
           byte[] uniCode = new String(temp).getBytes(); 
           if (uniCode[0] < 128 && uniCode[0] > 0) { 
             buffer.append(temp); 
           } 
           else { 
             buffer.append(convert(uniCode)); 
           } 
         } 
         return buffer.toString().substring(0,1); 
     } 
     
     private static char convert(byte[] bytes) { 
     
         char result = '-'; 
         int secPosvalue = 0; 
         int i; 
         for (i = 0; i < bytes.length; i++) { 
           bytes[i] -= GB_SP_DIFF; 
         } 
         secPosvalue = bytes[0] * 100 + bytes[1]; 
         for (i = 0; i < 23; i++) { 
           if (secPosvalue >= secPosvalueList[i] && 
               secPosvalue < secPosvalueList[i + 1]) { 
             result = firstLetter[i]; 
             break; 
           } 
         } 
         return result; 
     } 
      
     public static void main(String s[]){       
      System.out.print(getFirstLetter("好"));  
}